package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate redisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1、校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2、不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3、符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4、保存验证码到session中 //set key value ex 120
        redisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
//        session.setAttribute("code",code);
        //5、发送验证码
        log.debug("发送短信验证码成功，验证码："+code);
        // 返回ok
        return Result.ok();

    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1、校验手机号
        if (RegexUtils.isPhoneInvalid(loginForm.getPhone())) {
            //2、不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3、redis获取校验验证码
        String cacheCode =redisTemplate.opsForValue().get(LOGIN_CODE_KEY+loginForm.getPhone());
        String code = loginForm.getCode();
        //这里使用反向嵌套 避免太多代码冗余
//        if(cacheCode == null || !cacheCode.equals(code)) {
//            //3、不一致报错
//            return Result.fail("验证码错误");
//        }
        //4、一致，根据手机号查询用户 select * from tb_user where phone = ?
        User user = query().eq("phone",loginForm.getPhone()).one();
        //5、判段用户是否存在
        if(user == null){
            //6、不存在 创建并保存用户
            user = createUserWithPhone(loginForm.getPhone());
        }

        //7、保存用户信息到redis中
        //7.1 随机生成一个token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2 将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> stringObjectMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> {
                            if (fieldValue != null) {
                                return fieldValue.toString();
                            }
                            return null;
                        })
        );
        String key = LOGIN_USER_KEY+token;
        //7.3 存储
        redisTemplate.opsForHash().putAll(key,stringObjectMap);
        //7.4 设置token有效期
        redisTemplate.expire(key,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //8、返回用户
        return Result.ok(token);
    }
    private User createUserWithPhone(String phone){
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
         save(user);
         return user;
    }
}
